
    \begin{guess}
    ${a+b}{c^d}
    \sqrt[9]{x}$
    \end{guess}

    \begin{tabular}{|l|cccc|}
        \hline
        a&b&c&d&e\\
        \hline
        f&g&h&i&j\\
        \hline
    \end{tabular}

    $\left(\begin{array}{|l|cccc|}
        n&1&2&3&4\\
        n^2&1&4&9&16
    \end{array}\right)$

    \begin{question}
    $\frac{a+b}{c^d}\sqrt[9]{x}$
    \end{question}

    \textbackslash

    \textbackslash

    \textbackslash

    \textbackslash

    \textbackslash\par
    \textbackslash\par

    $\sum\limits_1^{2\to0}$\\[10pt]
    $\prod_1^2$\\*

    `Text'

    ``Text''

    I-am a fker in 1--9 --- like this.

    \begin{itemize}
        \item 条目1
        \item 条目2
    \end{itemize}

    \begin{enumerate}
        \item 条目1
        \item 条目2
    \end{enumerate}

    \begin{description}
        \item[A] 条目1
        \item[B] 条目2
    \end{description}

    \begin{verbatim}
        import "fmt"

        func main() {
            fmt.Println("Hi, Dog!")
        }

        fn main() {
            println!("Hi, Dog!");
        }
    \end{verbatim}

    \begin{center}
    \includegraphics[width=64mm,height=18mm]{../Pictures/bitcoin.jpeg} 
    \end{center}

    \begin{figure}[htbp!]
        \centering
        \includegraphics[scale=0.12]{../Pictures/bitcoin.jpeg}
        \caption{插头样例}
        \label{fig:float}
    \end{figure}

    \begin{figure}[htbp!]
        \centering
        \includegraphics[scale=0.2]{../Pictures/bitcoin.jpeg}
        \caption{插头样例}
        \label{fig:float2}
    \end{figure}